powder coating remover and their types

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powder coating remover and their types

like any other performance, in the process of applying powder coating, there may be some problems that need to be repaired. The process of repairing or refining the post-curing is not simple process, due to the general chemical and mechanical resistance of industrial paints, especially electrostatic powder colors.

Generally, there are two ways to remove, repair or renew powder coatings from metal:

  1. 1.      Physical (consist of two ways: 1. thermal 2. mechanical)
  2. 2.      Chemical

 

  1. A.     Thermal:

The use of high heat and direct flame to burn the coat layer off the metal surface, which is a very primary method in addition to the personal and personal safety hazards, the remaining ash itself and the carbon soils need to be washed and cleaned after burning the paint coating.

  1. B.      Mechanical:

Sandpapering, Sandblasting and surface grinding are used in this method for removing.

In addition to removing coatings from metal surfaces, these methods also exfoliate the surface, which may be desirable for sturdy and thick steel structures, but for fine and thin metal surfaces, limiting the removing process. In addition, sandblasting operations are likely to damage the form of structure and also be harmful to the environment.

Chemical method:

In this process solvents are used, which react with high quantities (usually immersion) on the surfaces painted in its molecular bonds. A reaction that breaks down transverse bonds and transverse bonds and solves color coatings.

These materials are divided into two main groups: base and acidic, which are commonly used as water soluble. 

a)      Acidic Removers

This type of removers can be used to clean all kinds of paints, including liquid and powder. The concentration of the solution to be used is 30% to 50% and varies depending on the thickness of coating layer on the surface. Depending on the type of color condition, it should be immersed in the solution at a temperature of 25 to 30 ° C at least 5 minutes and up to 60 minutes.

The evaporation temperature has greatly been increased by water solubility characteristic at ambient temperature

therefore, the durability of the solution will be increased for relatively long use too. it is necessary to gently stir the remover with a plastic mixer all the time when using this solution.

  • it is recommended to observe safety considerations, due to the acidity of the product.

b)     Alkaline Removers

This group of bleacher is usually used for furnaces liquid colors and air conditioners. It is also used in powder coats in the case that first, the base of coated surface should be metal, and secondly, it should have a concentration of about 35% to 50% in water. It should not be used on non-ferrous surfaces. The method of use is also immersed on the surface at a temperature of about 100 to 120 degrees.

One the main reason of using alkaline bleach is their cheap prices.

  • Safety and hygiene requirements should be strictly observed when using alkaline removers, duo to their very powerful corrosive substances.

 

c)      Gel removers:

This type of remover has a relatively higher safety in use and they are subgroup of removers that are used in removing all kinds of powder coating and liquid color and the method of applying them is by brushing the gel with a brush on the surface

 

                            

 

 

 

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